Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Houses protect us from heat, rain, cold, wind, and wild animals, providing us with a safe place to live.
Kutcha Houses: These are temporary houses usually found in villages. They are made of natural materials like mud, straw, wood, and bamboo.
Pucca Houses: These are permanent and strong houses found in towns and cities. They are built using materials like bricks, cement, iron, steel, and stones.
Cement and Mortar: To build walls, builders use a mixture of cement, sand, and water (). This mixture acts like a strong glue to hold bricks together.
Flooring Materials: Floors are made using various materials depending on the budget and requirement, such as cement, marble, granite, or ceramic tiles.
Roofing Materials: Roofs can be flat (made of concrete) or sloping (made of thatch, tiles, or asbestos sheets) depending on the climate of the region.
Doors and Windows: Wood, glass, and metals like aluminum or iron are used. Glass is used in windows because it allows sunlight to enter the house.
Concrete: A very strong material made by mixing cement, sand, gravel (small stones), and water ().
📐Formulae
💡Examples
Problem 1:
Identify the type of house that uses for its construction.
Solution:
Pucca House
Explanation:
Pucca houses are permanent structures built with strong materials like bricks, cement, and iron rods to ensure they last a long time.
Problem 2:
Rohan is building a window for his new room. He wants the room to be bright during the day. Which material should he use for the window panes?
Solution:
Glass
Explanation:
Glass is a transparent material, which means it allows sunlight to pass through it, making the room bright.
Problem 3:
Why is water () added to cement and sand while building a wall?
Solution:
To create a paste called mortar.
Explanation:
When water () is added to cement, a chemical reaction occurs that turns the powder into a thick paste. This paste eventually dries and becomes as hard as stone, binding the bricks together.